Thanks for the info on the engine coolant sensor. Changed it out today and the boat great with no black smoke. I didn't even have to wipe around the swim platform after pulling it out of the water!
Before installing the sensor I tried the paperclip trick but my check engine light didn't flash anything at all, not even the code 12? I'm guessing that the light is not even hooked up for some reason. I have a "check engine" and "transmission temp" light on my dash. Are these supposed to light up at any time during start-up like in a car?
Thanks again gentlemen.
1996 RED Prostar 205